Synthesis and characterisation of heterobimetallic <i>N</i>-substituted diethanolaminate-alkoxides of niobium(V)^†

Abstract

Heterobimetallic <i>N</i>-substituted diethanolaminate-alkoxide complexes of niobium(V) of the type: Nb(RDEA)₃ {M(OR¹)_n-1} (where RDEA == RN(CH₂CH₂O^-)₂ and R == Ph (<b>2</b>), Me(<b>3</b>) or Bu (<b>4</b>) (M == Al, n = 3, R¹ == Pr¹); Ph(M = Ga, n == 3, R¹= Pr¹ (<b>5</b>); Ph(M = Sb, n = 3, R¹ == Pr¹)(<b>6</b>); Ph(M = Ti, n = 4, R¹ = Pr¹)(<b>7</b>); Ph(M = Ge, n = 4, R¹ == Et)(<b>8</b>); Ph(M = Zr, N =4, R¹ == Pr¹);(<b>9</b>): Ph(M = Ta, n = 5, R¹ = Pr¹))(<b>10</b>)) have been prepared by the equimolar reactions of homoleptic N-substituted diethanolaminate complexes (ie.. metalloligands) of the formulation: Nb(RDEA)₂(RDEAH)(R == Ph (<b>1a</b>): Me (<b>1b</b>); Bu (<b>1e</b>) with different metal alkoxides. All of these heterobimetallic complexes have been characterised by analytical, molecular weight, and spectral (IR, ¹H and ²⁷Al NMR) data. On the basis of these resulls, plausible structures for the new complexes have been &nbsp;suggested . The synthesis and characterisation of a new series of heterobimetallic complexes reported in this paper greatly expand, the horizon of heterometal alkoxide chemistry. Furthermore, these fascinating compounds have obvious importance as precursors in ceramics.